Enhanced strength-ductility synergy in a gradient pseudo-precipitates heterostructured Al-2.5％Mg alloy:Design,fabrication,and deformation mechanism

Renhao Wu ¹Yeon Taek Choi ²Qingfeng Wu ³Xinxi Liu ⁴Dayong An ⁴Tianle Li ⁵Meng Li ⁴Hyoung Seop Kim⁶

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作者信息

1. Department of Plasticity Technology,School of Materials Science & Engineering,Shanghai Jiao Tong University,Shanghai 200030,China;Graduate Institute of Ferrous & Eco Materials Technology,Pohang University of Science and Technology,37673,South Korea
2. Department of Materials Science and Engineering,Pohang University of Science and Technology(POSTECH),37673,South Korea
3. Graduate Institute of Ferrous & Eco Materials Technology,Pohang University of Science and Technology,37673,South Korea
4. Department of Plasticity Technology,School of Materials Science & Engineering,Shanghai Jiao Tong University,Shanghai 200030,China
5. Department of Plasticity Technology,School of Materials Science & Engineering,Shanghai Jiao Tong University,Shanghai 200030,China;School of Materials Science & Engineering,Changsha University of Science & Technology,Changsha 410114,China
6. Graduate Institute of Ferrous & Eco Materials Technology,Pohang University of Science and Technology,37673,South Korea;Department of Materials Science and Engineering,Pohang University of Science and Technology(POSTECH),37673,South Korea;Advanced Institute for Materials Research(WPI-AIMR),Tohoku University,Sendai 980-8577,Japan;Institute for Convergence Research and Education in Advanced Technology,Yonsei University,Seoul 03722,South Korea
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Abstract

Heterostructures of alloyed composites,comprising heterogeneous domains with dramatically different constitutive properties,hold remarkable potential to expand the realm of material design systems and resolve the trade-off between strength and ductility.This study introduces an innovative materials de-sign method for synthesizing gradient pseudo-precipitates heterostructure(GPHS)in non-heat-treatable Al-2.5％Mg alloys.Utilizing cost-effective mild steel as both the diffusion source and protective layer,this heterostructure is achieved through pin-less friction stir-assisted cyclic localized deformation pro-cess.Exogenous Fe atoms diffuse across the interface by friction stir-induced heat conduction,forming Fe-Al second-phase particles in the Al alloy matrix.A rapid inter-diffusion mechanism is activated in conjunction with dense dislocation walls,grain boundaries,and sub-structures,resulting in the forma-tion of pseudo-precipitates.These pseudo-precipitates are ultimately dispersed in a gradient distribution throughout the entire thickness of the Al alloy matrix induced by localized incremental deformation.The GPHSed Al-2.5％Mg alloy exhibits an enhanced synergy of strength and ductility,with a uniform elonga-tion increase from 11％to 21.2％,while maintaining the strength.Multiple strengthening and hardening mechanisms,such as solid solution strengthening,dislocation hardening,and second phase strengthen-ing,work synergistically to promote mechanical performance.Notably,the hetero-deformation between hard pseudo-precipitates and soft Al alloy matrix induces additional strain hardening,leading to high ductility.This work provides a fresh perspective on the design and fabrication of high-performance alloys with advanced heterostructures,especially for non-heat-treatable alloys.

Key words

Gradient pseudo-precipitates/heterostructure/Enhanced strength-ductility synergy/Rapid diffusion/Hetero-deformation induced strain/hardening/Al-2.5％Mg alloy

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基金项目

National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIP)(NRF-2021R1A2C3006662)

National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIP)(NRF-2022R1A5A1030054)

Brain Pool Program through the National Research Foundation of Korea(NRF-RS202300263999)

出版年

2024

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCD

影响因子：0.657

ISSN：1005-0302

参考文献量82

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